/* =========================================
   Global Styles - 深色科技风核心样式库
   Project: sosoll.com (北京尧图网络科技有限公司)
   Style: Dark Tech + Neon Gradient + Glassmorphism
   ========================================= */

:root {
    /* 颜色系统 */
    --bg-dark: #050a14;
    --bg-card: rgba(20, 30, 50, 0.6);
    --bg-card-hover: rgba(30, 45, 70, 0.8);
    
    /* 霓虹渐变色 */
    --neon-blue: #00f2ff;
    --neon-green: #00ff9d;
    --neon-purple: #bd00ff;
    --gradient-main: linear-gradient(135deg, var(--neon-blue), var(--neon-green));
    --gradient-text: linear-gradient(90deg, var(--neon-blue), var(--neon-green), var(--neon-purple));
    
    /* 文字颜色 */
    --text-primary: #ffffff;
    --text-secondary: #a0b0c5;
    --text-muted: #64748b;
    
    /* 玻璃拟态 */
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    --backdrop-blur: blur(12px);
    
    /* 间距与布局 */
    --container-width: 1200px;
    --header-height: 80px;
    --section-padding: 100px 0;
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 242, 255, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(0, 255, 157, 0.05) 0%, transparent 40%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 工具类 */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: var(--section-padding);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* 玻璃卡片通用样式 */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: var(--backdrop-blur);
    -webkit-backdrop-filter: var(--backdrop-blur);
    border: var(--glass-border);
    border-radius: var(--border-radius);
    padding: 30px;
    transition: var(--transition);
    box-shadow: var(--glass-shadow);
    position: relative;
    overflow: hidden;
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-main);
    opacity: 0;
    transition: var(--transition);
}

.glass-card:hover {
    transform: translateY(-8px);
    background: var(--bg-card-hover);
    box-shadow: 0 20px 40px 0 rgba(0, 242, 255, 0.15);
}

.glass-card:hover::before {
    opacity: 1;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-primary {
    background: var(--gradient-main);
    color: #000;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--neon-green), var(--neon-blue));
    z-index: -1;
    opacity: 0;
    transition: var(--transition);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 242, 255, 0.4);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--neon-blue);
    color: var(--neon-blue);
}

.btn-outline:hover {
    background: var(--neon-blue);
    color: #000;
    box-shadow: 0 10px 30px rgba(0, 242, 255, 0.3);
}

/* 动画类 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式断点 */
@media (max-width: 1200px) {
    .container {
        max-width: 960px;
    }
    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    .container {
        max-width: 100%;
        padding: 0 15px;
    }
    .section {
        padding: 60px 0;
    }
    .section-title {
        font-size: 1.75rem;
    }
    .glass-card {
        padding: 20px;
    }
}